From: Kuo-Jung Su dant...@faraday-tech.com
The FTRTC011 is a flexible, small-area, and low-power Real Time Clock (RTC).
It accepts two clock sources: APB bus clock (PCLK) and 32.768 kHz clock.
When the system enters the sleep mode, the PCLK clock will be gated by the
system while RTC will keep on counting. This mechanism promises the lowest
power consumption when the system is asleep.
It provides separate second, minute, hour, and day counters. The second
counter is toggled each second, the minute counter is toggled each minute,
the hour counter is toggled each hour, and the day counter is toggled each day.
Because the second counter consumes the most power when the system is asleep,
the second toggled bits have to be separated. This counter separation mechanism
reduces the total power consumption when the system is in the sleep mode.
The counter separation mechanism also reduces the complexity of the software.
The software does not have to calculate the minute, hour, or day information.
It only needs to read the counter values and calculate the current time.
The FTRTC011 provides a programmable auto-alarm function. When the second
auto-alarm function is turned on, the RTC will automatically trigger an
interrupt each second. The automatic minute and hour alarms can be turned on
as well. This function is useful for implementing a clock.
Signed-off-by: Kuo-Jung Su dant...@faraday-tech.com
---
hw/ftrtc011.c | 315 +
1 file changed, 315 insertions(+)
create mode 100644 hw/ftrtc011.c
diff --git a/hw/ftrtc011.c b/hw/ftrtc011.c
new file mode 100644
index 000..71dd421
--- /dev/null
+++ b/hw/ftrtc011.c
@@ -0,0 +1,315 @@
+/*
+ * QEMU model of the FTRTC011 RTC Timer
+ *
+ * Copyright (C) 2012 Faraday Technology
+ * Written by Dante Su dant...@faraday-tech.com
+ *
+ * This file is licensed under GNU GPL v2.
+ */
+
+#include sysbus.h
+#include sysemu/sysemu.h
+#include qemu/timer.h
+
+/* Hardware registers */
+#define REG_SEC 0x00
+#define REG_MIN 0x04
+#define REG_HOUR0x08
+#define REG_DAY 0x0C
+
+#define REG_ALARM_SEC 0x10
+#define REG_ALARM_MIN 0x14
+#define REG_ALARM_HOUR 0x18
+
+#define REG_CR 0x20
+#define REG_WSEC0x24
+#define REG_WMIN0x28
+#define REG_WHOUR 0x2C
+#define REG_WDAY0x30
+#define REG_ISR 0x34
+
+#define REG_REV 0x3C
+#define REG_CURRENT 0x44
+
+enum ftrtc011_irqpin {
+IRQ_ALARM_LEVEL = 0,
+IRQ_ALARM_EDGE,
+IRQ_SEC,
+IRQ_MIN,
+IRQ_HOUR,
+IRQ_DAY,
+};
+
+#define TYPE_FTRTC011 ftrtc011
+
+typedef struct Ftrtc011State {
+SysBusDevice busdev;
+MemoryRegion mmio;
+
+qemu_irq irq[6];
+
+QEMUTimer *qtimer;
+
+uint8_t sec;
+uint8_t min;
+uint8_t hr;
+uint32_t day;
+
+uint8_t alarm_sec;
+uint8_t alarm_min;
+uint8_t alarm_hr;
+
+uint32_t cr;
+uint32_t isr;
+
+} ftrtc011_state;
+
+#define FTRTC011(obj) \
+OBJECT_CHECK(ftrtc011_state, obj, TYPE_FTRTC011)
+
+/* Update interrupts. */
+static void ftrtc011_update_irq(ftrtc011_state *s)
+{
+uint32_t mask = ((s-cr 1) 0x1f) s-isr;
+
+qemu_set_irq(s-irq[IRQ_ALARM_LEVEL], (mask 0x10) ? 1 : 0);
+
+if (mask) {
+if (mask 0x01) {
+qemu_irq_pulse(s-irq[IRQ_SEC]);
+}
+if (mask 0x02) {
+qemu_irq_pulse(s-irq[IRQ_MIN]);
+}
+if (mask 0x04) {
+qemu_irq_pulse(s-irq[IRQ_HOUR]);
+}
+if (mask 0x08) {
+qemu_irq_pulse(s-irq[IRQ_DAY]);
+}
+if (mask 0x10) {
+qemu_irq_pulse(s-irq[IRQ_ALARM_EDGE]);
+}
+}
+}
+
+static uint64_t ftrtc011_mem_read(void *opaque, hwaddr addr, unsigned size)
+{
+ftrtc011_state *s = FTRTC011(opaque);
+uint32_t rc = 0;
+
+switch (addr) {
+case REG_SEC:
+return s-sec;
+case REG_MIN:
+return s-min;
+case REG_HOUR:
+return s-hr;
+case REG_DAY:
+return s-day;
+case REG_ALARM_SEC:
+return s-alarm_sec;
+case REG_ALARM_MIN:
+return s-alarm_min;
+case REG_ALARM_HOUR:
+return s-alarm_hr;
+case REG_CR:
+return s-cr;
+case REG_ISR:
+return s-isr;
+case REG_REV:
+return 0x0001;
+case REG_CURRENT:
+return (s-day 17) | (s-hr 12) | (s-min 6) | (s-sec);
+default:
+break;
+}
+
+return rc;
+}
+
+static void ftrtc011_mem_write(void*opaque,
+ hwaddr addr,
+ uint64_t val,
+ unsigned size)
+{
+ftrtc011_state *s = FTRTC011(opaque);
+
+switch (addr) {
+case REG_ALARM_SEC:
+s-alarm_sec = (uint32_t)val;
+break;
+case REG_ALARM_MIN:
+s-alarm_min = (uint32_t)val;
+break;
+case REG_ALARM_HOUR:
+s-alarm_hr = (uint32_t)val;
+break;
+case REG_WSEC:
+
